<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html> 
<head> 
 
 
    <meta http-equiv="content-type" content="text/html; charset=utf-8"> 
<title>TabView Control</title> 
 
<style type="text/css"> 
/*margin and padding on body element
  can introduce errors in determining
  element position and are not recommended;
  we turn them off as a foundation for YUI
  CSS treatments. */
body {
	margin:0;
	padding:0;
}
</style> 
 
<link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/2.8.1/build/fonts/fonts-min.css" /> 
<link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/2.8.1/build/tabview/assets/skins/sam/tabview.css" /> 

<script src="../../../../../build/yahoo/yahoo.js"></script>
<script src="../../../../../build/dom/dom.js"></script>
<script src="../../../../../build/event/event.js"></script>
<script src="../../../../../build/element/element.js"></script>
<script src="../../../../../build/tabview/tabview.js"></script>
<script src="../../../../../build/history/history.js"></script>

<!--there is no custom header content for this example--> 
 
</head> 
 
<body class="yui-skin-sam"> 
 
 
<h1>TabView Control</h1> 
 
<div class="exampleIntro"> 
	<p> 
  This example demonstrates how to use the Browser History Manager
  to remember which tabs have been visited with the TabView widget
  and dynamically update it when the user presses the browser's
  back/forward buttons.
</p> 
			
</div> 
 
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== --> 
 
<style> 
 
#yui-history-iframe {
  position:absolute;
  top:0; left:0;
  width:1px; height:1px; /* avoid scrollbars */
  visibility:hidden;
}
 
#demo { margin-bottom:1em; }
 
</style> 
 
<!-- Static markup required by the browser history utility. Note that the
     iframe is only used on Internet Explorer. If this page is server
     generated (by a PHP script for example), it is a good idea to create
     the IFrame ONLY for Internet Explorer (use server side user agent sniffing) --> 
 
<iframe id="yui-history-iframe" src="assets/blank.html"></iframe> 
<input id="yui-history-field" type="hidden"> 
 
<!-- Static markup required for the TabView widget. --> 
 
<div id="demo" class="yui-navset yui-navset-top"> 
  <ul class="yui-nav"> 
    <li><a href="#tab1"><em>Tab One Label</em></a></li> 
    <li title="active" class="selected"><a href="#tab2"><em>Tab Two Label</em></a></li> 
    <li title="" class=""><a href="#tab3"><em>Tab Three Label</em></a></li> 
  </ul> 
  <div class="yui-content"> 
    <div id="tab1"><p>Tab One Content</p></div> 
    <div id="tab2"><p>Tab Two Content</p></div> 
    <div id="tab3"><p>Tab Three Content</p></div> 
  </div> 
</div> 
 
<script> 
 
(function () {
 
    // The initially selected tab will be chosen in the following order:
    //
    // URL fragment identifier (it will be there if the user previously
    // bookmarked the application in a specific state)
    //
    //         or
    //
    // "tab0" (default)
 
    var bookmarkedTabViewState = YAHOO.util.History.getBookmarkedState("tabview");
    var initialTabViewState = bookmarkedTabViewState || "tab0";
 
    var tabView;
 
    // Register our TabView module. Module registration MUST
    // take place before calling YAHOO.util.History.initialize.
    YAHOO.util.History.register("tabview", initialTabViewState, function (state) {
        // This is called after calling YAHOO.util.History.navigate, or after the user
        // has trigerred the back/forward button. We cannot discrminate between
        // these two situations.
 
        // "state" can be "tab0", "tab1" or "tab2".
        // Select the right tab:
        tabView.set("activeIndex", state.substr(3));
    });
 
    function handleTabViewActiveTabChange (e) {
        var newState, currentState;
 
        newState = "tab" + this.getTabIndex(e.newValue);
 
        try {
            currentState = YAHOO.util.History.getCurrentState("tabview");
            // The following test is crucial. Otherwise, we end up circling forever.
            // Indeed, YAHOO.util.History.navigate will call the module onStateChange
            // callback, which will call tabView.set, which will call this handler
            // and it keeps going from here...
            if (newState != currentState) {
                YAHOO.util.History.navigate("tabview", newState);
            }
        } catch (e) {
            tabView.set("activeIndex", newState.substr(3));
        }
    }
 
    function initTabView () {
        // Instantiate the TabView control...
        tabView = new YAHOO.widget.TabView("demo");
        tabView.addListener("activeTabChange", handleTabViewActiveTabChange);
    }
 
    // Use the Browser History Manager onReady method to instantiate the TabView widget.
    YAHOO.util.History.onReady(function () {
        var currentState;
 
        initTabView();
 
        // This is the tricky part... The onLoad event is fired when the user
        // comes back to the page using the back button. In this case, the
        // actual tab that needs to be selected corresponds to the last tab
        // selected before leaving the page, and not the initially selected tab.
        // This can be retrieved using getCurrentState:
        currentState = YAHOO.util.History.getCurrentState("tabview");
        tabView.set("activeIndex", currentState.substr(3));
    });
 
    // Initialize the browser history management library.
    try {
        YAHOO.util.History.initialize("yui-history-field", "yui-history-iframe");
    } catch (e) {
        // The only exception that gets thrown here is when the browser is
        // not supported (Opera, or not A-grade) Degrade gracefully.
        initTabView();
    }
 
})();
 
</script> 
 
<!--END SOURCE CODE FOR EXAMPLE =============================== --> 
 
</body> 
</html> 
 
